The Simons Observatory: beam characterization for the small aperture telescopes by Dachlythra, N, Duivenvoorden, AJ, Gudmundsson, JE, Hasselfield, M, Coppi, G, Adler, AE, Alonso, D, Azzoni, S, Chesmore, GE, Fabbian, G, Ganga, K, Gerras, RG, Jaffe, AH, Johnson, BR, Keating, B, Keskitalo, R, Kisner, TS, Krachmalnicoff, N, Lungu, M, Matsuda, F, Naess, S, Page, L, Puddu, R, Puglisi, G, Simon, SM, Teply, G, Tsan, T, Wollack, EJ, Wolz, K, Xu, Z